Three people have confirmed that it works precisely like this and yet still you argue?

Darth Bandon engages Revan before before the Korriban Star Map, only if 4th Star Map has been found first (i.e. if Korriban is your 2nd to last star map). Otherwise if Korriban is the 4th star map, then Bandon will engage you on your way back to the academy, after you've whooped whichever Sith Masters you've decided to whoop.

I'm not a subject of group think. It could be done, but it would require that you go through Korriban entirely before going through the final trial. Otherwise, you would encounter Bandon on your way through that level.

It could be done, but you would have to transition DIRECTLY from the academy to the tomb. Otherwise, you would run into him before you got the second-last star map.